Despite looking as though Rey might be fighting alongside Supreme Leader Snoke's Praetorian Guard after she grabs Kylo's lightsaber with the Force, a leaked, widescreen version of the teaser shows the warrior on her right turning to attack her.

So what's going on here? Is she fighting against Kylo Ren? Teaming up with him against Snoke, perhaps? Or is this more evidence that the mysterious young woman will turn to the dark side in Rian Johnson's movie?

Previous trailers have shown Rey training with Luke Skywalker's original blue lightsaber (the one that once belonged to Anakin Skywalker) after she finally accepted it at the end of The Force Awakens.

Kylo's crossguard lightsaber – which is based on an ancient design – is the red colour typical of Sith and other dark side Force users.